user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/posix/pthread_schedparam.c

@@ -0,0 +1,34 @@
+#include <assert.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdlib.h>
+
+int main() {
+	struct sched_param param = {
+		.sched_priority = 100,
+	};
+
+	int policy = 0xDEADBEEF;
+
+	int ret = pthread_getschedparam(pthread_self(), &policy, &param);
+	assert(policy == SCHED_OTHER);
+	assert(!ret);
+
+	param.sched_priority = 10;
+
+	ret = pthread_setschedparam(pthread_self(), SCHED_FIFO, &param);
+	assert(!ret || ret == EPERM);
+
+	if(ret == EPERM) {
+		exit(0);
+	}
+
+	param.sched_priority = 0xDEADBEEF;
+
+	ret = pthread_getschedparam(pthread_self(), &policy, &param);
+	assert(policy == SCHED_FIFO);
+	assert(param.sched_priority == 10);
+	assert(!ret);
+
+	return 0;
+}